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For the Northern Hemisphere, the official summer season starts on June 20 or 21, depending on where you live, with the arrival of the summer solstice. So what is a solstice, exactly? It's the result of Earth's north-south axis being tilted 23.4 degrees toward the sun. This tilt causes different amounts of sunlight to reach different regions of the planet during Earth's year-long orbit around the sun. [Source: National Geographic]
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